package com.hmdp.utils;

import cn.hutool.core.collection.CollectionUtil;
import cn.hutool.core.lang.UUID;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.data.redis.core.script.RedisScript;

import javax.annotation.Resource;
import java.util.Collections;
import java.util.concurrent.TimeUnit;

public class SimpleRedisLock implements ILock{

    private  String name ;


    private StringRedisTemplate stringRedisTemplate;

    public SimpleRedisLock(String name, StringRedisTemplate stringRedisTemplate) {
        this.name = name;
        this.stringRedisTemplate = stringRedisTemplate;
    }

    private static  final String KEY_PREFIX = "lock";
    private static  final String ID_PREFIX = UUID.randomUUID().toString(true) +"-";
    private static final DefaultRedisScript<Long> UNLOCK_SCRIPT;
    static {
        UNLOCK_SCRIPT =new DefaultRedisScript<>();
        UNLOCK_SCRIPT.setLocation(new ClassPathResource("unlock.lua"));
        UNLOCK_SCRIPT.setResultType(Long.class);
    }


    @Override
    public boolean tryLock(Long timeoutSec) {


        //获取线程标识
        String threadId =ID_PREFIX + Thread.currentThread().getId();
        //获取锁
        Boolean success = stringRedisTemplate.opsForValue().setIfAbsent(KEY_PREFIX + name, threadId + "", timeoutSec, TimeUnit.SECONDS);

        return Boolean.TRUE.equals(success);
    }

    @Override
    public void unLock() {
        //调用脚本,execute传三个参数，脚本，key（锁的标识），线程id
        stringRedisTemplate.execute(UNLOCK_SCRIPT,
                Collections.singletonList(KEY_PREFIX + name),
                ID_PREFIX + Thread.currentThread().getId());
    }

    /*   @Override
    public void unLock() {
        //获取线程标示
        String threadId =ID_PREFIX + Thread.currentThread().getId();
        //获取锁中的标识
        String id = stringRedisTemplate.opsForValue().get(KEY_PREFIX + name);
        //判断是否一致
        if (threadId.equals(id))
        {
            //释放锁
            stringRedisTemplate.delete(KEY_PREFIX + name);
        }

    }*/

}
